W dniu 30.10.2020 o 23:51, Tony Thigpen pisze:
All,
I have a z/VSE client that believes it is time to move to z/OS. But,
they have one big concern. They have a lot of ShareOption=4 VSAM files.
For those that don't know it, ShareOption=4 files on z/VSE "work out
of the box" without any need for the application program to perform
any enqueue or dequeue. z/VSE automatically performs those functions,
unlike z/OS where the application has to handle the enqueue process.
In their case, they use shareoption=4 so that they can update VSAM
files from batch Cobol programs while at the same time CICS Cobol
programs are also updating the files. They don't want to have to
change their programs.
From my initial research, it appears that this same function can be
reproduced on z/OS using DFHSMStvs. (And, it looks like VSAM-RLS is
also required to support DFHSMStvs.)
Are we going down the right path?
IMHO no.
Some remarks:
1. Any migration will require some work to do. Sometimes little less
effort give you much worse results.
2. SHR (x 4) means cross-system sharing. Why it is cross-system? Why
don't you consolidate it into one system? What are the reasons?
3. VSAM RLS is almost free - that means it is not licensed, but it
require Coupling Facility - even in single system configuration. Such
kind of Parallel Sysplex. Even when you want to have single CPC, you
still need CPU engine for CF, that is ICF processor. It is approx. 250k$
(for big machine). And some memory. However tvs is not necessary. Note:
tvs is paid, because there are ISV options. And there are some IBM
add-ons like CICSVR, etc.
4. Let's go back to point 1 - maybe it is good time to move from VSAM to
Db2? Note, there is special software product which allow VSAM
application to work with Db2 with minimal changes. And of course you
would have a lot of Db2 advantages over VSAM, and any new development
could directly interface with Db2, not Db2 under cover of VSAM. Of
course neither the product, nor Db2 is free, but...
--
Radoslaw Skorupka
Lodz, Poland
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